Removal & Installation
- On E420, S350, S420 and S500, control unit is inside control module box located at left rear of engine compartment. Turn ignition switch to off position. Remove control module box cover. Using Remover (140 589 01 33 00), remove control unit. To install, reverse removal procedure.
- On all other models, control unit is located in engine compartment. Turn ignition off. Push back holding springs. Remove electronic control unit from bracket. Actuate lock. Pull plug from unit. To install, reverse removal procedure. When mounting plug on unit, ensure plug lock can be heard engaging.